# AI Rook, free: Email verification API

> Email validation — syntax check plus live MX record DNS lookup to confirm deliverability.

AI Rook's Free trial plan for the email verification API costs $0.00 per 1,000 emails. We check each provider's docs for 6 fields. AI Rook's docs list 3: Address, Deliverability, Company.
We ran AI Rook in [our email verification API benchmark](https://datacircle.dev/best-email-verification-api.txt). We didn't score any AI Rook plan.
This plan is free. We rank 4,337 plans for email verification APIs by price. Half the plans cost $2.00 or less per 1,000 emails. [See the best free email verification API plan.](https://datacircle.dev/best-email-verification-api.txt)
[treg's top-up from $10](https://datacircle.dev/validate-email-apis/treg/top-up-from-10/llms.txt) is the cheapest paid plan per 1,000 emails: $0.00 on average. treg asks one provider after another until one answers. You pay $68.365 per 1,000 emails when no provider answers. [StableEnrich's pay-as-you-go plan](https://datacircle.dev/validate-email-apis/stableenrich/pay-as-you-go-pay-per-request-with-x402-or-mpp-post-api-minerva-validate-emails/llms.txt) costs the least for 10,000 emails a month: $0.05.
[Disify's $9 monthly plan (/email)](https://datacircle.dev/validate-email-apis/disify/9-monthly-starter-post-email/llms.txt) covers any number of emails. Disify's $9 monthly plan costs less up front than treg's top-up from $10.
[pingutil](https://datacircle.dev/validate-email-apis/pingutil/free-api-key-post-v1-verify/llms.txt), [Validemail.co](https://datacircle.dev/validate-email-apis/validemail-co/9-90-monthly-9-90-month-get-api-v1-validate/llms.txt) and [looot](https://datacircle.dev/validate-email-apis/looot/top-up/llms.txt) are the best email verification API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-email-apis/ai-rook/free
- [Email validation API: best verification providers compared](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://agents.ai-rook.com/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- Request: `POST https://agents.ai-rook.com/api/email-validate`
- API key: not needed
- Its API docs: https://agents.ai-rook.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing#/paths/~1api~1email-validate
- Sold by: AI Rook (https://ai-rook.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 50%
- Address: ✓
- Deliverability: ✓
- Company: ✓

## Price

- $ per 1,000 emails: $0.00
- Per: call
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Also pays for: 74 other calls: one free call each

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Email validation — syntax check plus live MX record DNS lookup to confirm deliverability.

## Data

- What it checks: format, mail servers
- Keep data: no API terms
- Use data: no API terms

## Plan

- Pay: $0
- You get: 1 request
- Enough for: 1 call, once

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email
- Method: POST
- Path: /api/email-validate

## About the plan

- Plan: Free trial
- Who can get it: anyone, one free call per wallet or IP address on each paid endpoint

## The 5 fields the plan's answer can hold

email, domain, syntax valid, MX found, valid

## AI Rook's plans (3)

- [AI Rook, free](https://datacircle.dev/validate-email-apis/ai-rook/free/llms.txt): $0.00 per 1,000, 50% complete
- [AI Rook, pay as you go](https://datacircle.dev/validate-email-apis/ai-rook/pay-as-you-go/llms.txt): $1.00 per 1,000, 50% complete
- [AI Rook, $5 pack](https://datacircle.dev/validate-email-apis/ai-rook/5-pack/llms.txt): $100.00 per 1,000, 50% complete

## AI Rook's calls for this API (1)

- `POST /api/email-validate`: [AI Rook, free](https://datacircle.dev/validate-email-apis/ai-rook/free/llms.txt)

## AI Rook's APIs (4)

- [AI Rook: domain WHOIS API pricing, 3 plans](https://datacircle.dev/domain-whois-apis/ai-rook/free/llms.txt)
- [AI Rook: email verification API pricing, 3 plans](https://datacircle.dev/validate-email-apis/ai-rook/free/llms.txt)
- [AI Rook: IP company lookup API pricing, 3 plans](https://datacircle.dev/ip-company-lookup-apis/ai-rook/free/llms.txt)
- [AI Rook: web scraping API pricing, 3 plans](https://datacircle.dev/web-scraping-apis/ai-rook/free/llms.txt)

## AI Rook: email verification API alternatives

- [Prime Verifier, $200 pack, Pay-As-You-Go 200,000 credits, POST /v1/verify/single](https://datacircle.dev/validate-email-apis/prime-verifier/200-pack-pay-as-you-go-200000-credits-post-v1-verify-single/llms.txt): $1.00 per 1,000, 50% complete
- [BillionVerify, $20 pack, Starter, POST /verify/bulk](https://datacircle.dev/validate-email-apis/billionverify/20-pack-starter-post-verify-bulk/llms.txt): $1.00 per 1,000, 67% complete, live
- [MillionPhones, $100 monthly](https://datacircle.dev/validate-email-apis/millionphones/100-monthly/llms.txt): $1.00 per 1,000, 33% complete, live
- [DeBounce, top-up from $200, 200K credits, GET /v1/, Single email validation](https://datacircle.dev/validate-email-apis/debounce/top-up-from-200-200k-credits-get-v1/llms.txt): $1.00 per 1,000, 50% complete, live
- [Agent402 Tools, pay as you go](https://datacircle.dev/validate-email-apis/agent402-tools/pay-as-you-go/llms.txt): $1.00 per 1,000, 50% complete

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-09.

- https://agents.ai-rook.com/.well-known/x402?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://agents.ai-rook.com/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://agents.ai-rook.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://ai-rook.com/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing
- https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=email-verification-api-pricing